5 products
Fermentation Stoppers for Every Setup
A reliable stopper is essential for every brewer’s toolkit. Craft a Brew’s Fermentation Stoppers create an airtight seal on your carboy, fermenter, or flask—keeping oxygen and contaminants out while letting your airlock or thermowell fit securely.
Whether you’re fermenting beer, wine, or kombucha, our selection of rubber, foam, and universal stoppers provides the perfect fit for your setup. Each stopper is made from durable, food-grade materials to ensure a clean, safe fermentation process.
Popular Fermentation Stoppers
- Carboy Rubber Stopper – A durable, snug-fit rubber stopper ideal for standard glass carboys.
- Thermowell and Stopper (The Stasis) – Designed for The Stasis glycol chiller system to accurately monitor temperature during fermentation.
- Small Drilled Universal Carboy Stopper – Fits most small-neck fermenters and allows for an airlock or thermometer insertion.
- Medium Drilled Universal Carboy Stopper – Versatile size for mid-range carboys and buckets, providing a secure seal.
- Foam Stopper for Erlenmeyer Flask – Perfect for yeast starters, allowing gas exchange while preventing contamination.
Why Choose the Right Stopper?
- Prevents Contamination – Creates a tight seal to block out airborne bacteria and debris.
- Supports Accessories – Works with airlocks, thermowells, and tubing for customized setups.
- Multiple Sizes Available – Choose the perfect fit for your fermenter, flask, or brewing system.
- Reusable & Easy to Clean – Crafted from durable, food-grade materials that withstand repeated use.
Related Brewing Equipment
- Fermentation Airlocks – Pair with your stopper for clean and controlled fermentation.
- Fermenter Accessories – Find extra parts and upgrades for your brewing system.
- How to Make Beer – Learn how to manage fermentation like a pro.
Frequently Asked Questions
What size stopper do I need for my carboy?
Measure the carboy opening and match it to our universal stopper sizes. Small stoppers fit 1-gallon carboys, while medium sizes fit most 5–6.5 gallon carboys.
Can I use a drilled stopper for an airlock?
Yes. Drilled stoppers are designed to hold fermentation airlocks securely in place for gas release during fermentation.
Are foam stoppers safe for yeast starters?
Absolutely. Foam stoppers allow gas to escape while preventing airborne contaminants from entering your flask.
How do I clean and sanitize my stopper?
Rinse with warm water and sanitize using One Step No Rinse Cleanser before each use.
Are stoppers reusable?
Yes. All Craft a Brew stoppers are made from durable materials designed for multiple fermentations.
Seal Your Fermentation with Confidence
Craft a Brew’s Fermentation Stoppers are the finishing touch to a successful setup. Find the right size and type for your next batch and keep your fermentation safe, clean, and controlled.
